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  1. grady   : vertical gradient filter.
  2. Computes the vertical first derivative.
  3. out-img = grady(in-img) * (mul/1024) + add.
  4. cmnd: grady in-img,out-img, mul  ,  add
  5. dflt: grady    A  ,   B  , 1024  ,  128
  6. range:       <A-D>,<A-D> ,<10000>,<+/-255>
  7.